EP2747565B1 - Seed treatment methods - Google Patents

Seed treatment methods Download PDF

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EP2747565B1
EP2747565B1 EP12769213.5A EP12769213A EP2747565B1 EP 2747565 B1 EP2747565 B1 EP 2747565B1 EP 12769213 A EP12769213 A EP 12769213A EP 2747565 B1 EP2747565 B1 EP 2747565B1
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seed
planting
signal molecule
lco
plant
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French (fr)
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EP2747565A1 (en
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R. Stewart Smith
Ahsan Habib
John KOSANKE
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Novozymes BioAg AS
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Novozymes BioAg AS
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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C1/00—Apparatus, or methods of use thereof, for testing or treating seed, roots, or the like, prior to sowing or planting
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N31/00—Biocides, pest repellants or attractants, or plant growth regulators containing organic oxygen or sulfur compounds
    • A01N31/06—Oxygen or sulfur directly attached to a cycloaliphatic ring system
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01C—PLANTING; SOWING; FERTILISING
    • A01C1/00—Apparatus, or methods of use thereof, for testing or treating seed, roots, or the like, prior to sowing or planting
    • A01C1/06—Coating or dressing seed
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N43/00—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds
    • A01N43/02—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms
    • A01N43/04—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom
    • A01N43/14—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom six-membered rings
    • A01N43/16—Biocides, pest repellants or attractants, or plant growth regulators containing heterocyclic compounds having rings with one or more oxygen or sulfur atoms as the only ring hetero atoms with one hetero atom six-membered rings with oxygen as the ring hetero atom
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05C—NITROGENOUS FERTILISERS
    • C05C11/00—Other nitrogenous fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F11/00—Other organic fertilisers
    • C—CHEMISTRY; METALLURGY
    • C05—FERTILISERS; MANUFACTURE THEREOF
    • C05F—ORGANIC FERTILISERS NOT COVERED BY SUBCLASSES C05B, C05C, e.g. FERTILISERS FROM WASTE OR REFUSE
    • C05F11/00—Other organic fertilisers
    • C05F11/08—Organic fertilisers containing added bacterial cultures, mycelia or the like
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01N—PRESERVATION OF BODIES OF HUMANS OR ANIMALS OR PLANTS OR PARTS THEREOF; BIOCIDES, e.g. AS DISINFECTANTS, AS PESTICIDES OR AS HERBICIDES; PEST REPELLANTS OR ATTRACTANTS; PLANT GROWTH REGULATORS
    • A01N63/00—Biocides, pest repellants or attractants, or plant growth regulators containing microorganisms, viruses, microbial fungi, animals or substances produced by, or obtained from, microorganisms, viruses, microbial fungi or animals, e.g. enzymes or fermentates

Definitions

  • the biochemical basis for these relationships includes an exchange of molecular signaling, wherein the plant-to-bacteria signal compounds include flavones, isoflavones and flavanones, and the bacteria-to-plant signal compounds, which include the end products of the expression of the Bradyrhizobial and Rhizobial nod genes, known as lipo-chitooligosaccharides (LCOs).
  • LCOs lipo-chitooligosaccharides
  • WO2005/087005 discloses the use of a one or more Isoflavonoid compound Signals which may be with an agriculturally acceptable carrier, applied prior to planting.
  • WO20099/049747 discloses biological composition for enhancing plant growth and crop yield, comprising lipo-chitooligosaccharide, and flavonoid compound including flavones, flavanols, flavonols, flavanones or isoflavones.
  • U.S. Patent 6,979,664 teaches a method for enhancing seed germination or seedling emergence of a plant crop, comprising the steps of providing a composition that comprises an effective amount of at least one lipo-chitooligosaccharide and an agriculturally suitable carrier and applying the composition in the immediate vicinity of a seed or seedling in an effective amount for enhancing seed germination of seedling emergence in comparison to an untreated seed or seedling.
  • compositions and methods are taught to be applicable to both legumes and non-legumes, and may be used to treat a seed (just prior to planting), seedling, root or plant.
  • WO 2008/085958 teaches compositions for enhancing plant growth and crop yield in both legumes and non-legumes, and which contain LCOs in combination with another active agent such as a chitin or chitosan, a flavonoid compound, or an herbicide, and which can be applied to seeds and/or plants concomitantly or sequentially.
  • another active agent such as a chitin or chitosan, a flavonoid compound, or an herbicide
  • Kidaj et al. "Nod factors stimulate seed germination and promote growth and nodulation of pea and vetch under competitive conditions," Microbiol Res 25426 (2011 ) and Maj et al., “Pretreatment of Clover Seeds with Nod Factors Improves Growth and Nodulation of Trifolium pratense,” J. Chem Ecol (2009) 35:479-487 .
  • the present invention provides methods of enhancing plant growth and crop production in which the beneficial effect of a plant signal molecule (plant growth-enhancing agent) may be obtained without the need to apply the plant signal molecule (plant growth-enhancing agent) to the seed contemporaneously with planting.
  • the present invention is based, in part, on the discovery that treatment of seeds with a plant signal molecule which is an LCO, followed by prolonged storage prior to planting, results in enhanced plant growth, including greater plant yield and/or leaf surface area and/or root number, length and mass, compared to plants harvested from both untreated seeds.
  • the present invention also provides methods of enhancing plant growth and crop production in which additional improvements may be obtained over plants crops produced from seeds treated just prior to or within a week or less of planting.
  • a first aspect of the present invention is directed to a method of enhancing plant growth, comprising treating seed at least one month (thirty days) prior to planting with an effective amount of a plant signal molecule, wherein the plant signal molecule is a lipochitooligosaccharide.
  • the seed may be treated in accordance with the present method at 2 months prior to planting, at least 3 months prior to planting, at least 4 months prior to planting, at least 5 months prior to planting, at least 6 months prior to planting, at least 9 months prior to planting, at least 1 year prior to planting, at least 2 years prior to planting and in some embodiments, at least 3 years prior to planting.
  • the treatment is used to produce a plant (crop) that exhibits at least one of increased yield measured in terms of bushels/acre, increased root number, increased root length, increased root mass, increased root volume and increased leaf area, compared to plants harvested from untreated seed.
  • the treatment may be used to produce a plant (crop) that exhibits at least one of increased yield measured in terms of bushels/acre, increased root number, increased root length, increased root mass, increased root volume and increased leaf area compared to a plant (crop_ harvested from seed treated with the signal molecule just prior to or within a week or less of planting.
  • the plant signal molecule is a lipo-chitooligosaccharide (LCO).
  • the LCO is recombinant.
  • the LCO is synthetic.
  • the LCO is obtained from a microorganism, e.g., a species of Rhizobium selected from Rhizobium sp., Bradyrhizobium sp., e.g., Bradyrhizobium japonicum, Sinorhizobium sp. and Azorhizobium sp, or from an arbuscular mycorrhizal fungus.
  • the treating further comprises contacting the seed with at least one other agronomically beneficial agent, e.g., diazotroph (Rhizobial inoculant), mycorrhizal fungi, a phosphate solubilizing agent, herbicide, insecticide or a fungicide.
  • the treating entails spraying a composition comprising the plant signal molecule onto the seed, and in some other embodiments, the treating entails dripping the composition onto the seeds.
  • the method of the present invention is applicable to legumes and non-legumes alike.
  • the leguminous seed is soybean seed.
  • the seed that is treated is non-leguminous seed such as a field crop seed, e.g., corn, or a vegetable crop seed.
  • the seed may be treated in accordance with the present method anywhere from one month (thirty days) up to 1 year, 2 years and in some embodiments, even 3 years prior to planting, depending on particular seed properties (viability after storage) or industry standards.
  • soybean seeds are generally planted the following season, whereas corn seed can be stored for much longer periods of time including upwards of 3 years prior to planting.
  • the benefits of signal molecules/plant growth-enhancing agents may be obtained even though the signal molecules are applied to a seed significantly prior to the time of planting and after prolonged storage period.
  • embodiments of the present invention that entailed treatment of soybean seed with an LCO from Bradyrhizobium japonicum exhibited increased plant yield, leaf surface area, and increased root length and root volume compared to both untreated seed and seed treated with the LCO just prior to or within a week of planting.
  • plant signal molecule which may be used interchangeably with “plant growth-enhancing agent” broadly refers to any agent, both naturally occurring in plants or microbes, and synthetic (and which may be non-naturally occurring) that directly or indirectly activates a plant biochemical pathway, resulting in increased plant growth, measureable at least in terms of at least one of increased yield measured in terms of bushels/acre, increased root number, increased root length, increased root mass, increased root volume and increased leaf area.
  • plant signal molecules that may be useful in the practice of the present invention are lipo-chitooligosaccharide compounds (LCO's).
  • the plant signal molecule may be isolated and/or purified component.
  • isolated means the signal molecule is removed from its natural state and separated from other molecules naturally associated with it.
  • purified means that the concentration of the signal molecule is increased (by a purification process) relative to other components, e.g., unwanted or inferior components.
  • LCO's also known in the art as symbiotic Nod signals or Nod factors, consist of an oligosaccharide backbone of ⁇ -1,4-linked N -acetyl-D-glucosamine ("GIcNAc") residues with an N-linked fatty acyl chain condensed at the nonreducing end. LCO's differ in the number of GIcNAc residues in the backbone, in the length and degree of saturation of the fatty acyl chain, and in the substitutions of reducing and nonreducing sugar residues.
  • GIcNAc N -acetyl-D-glucosamine
  • LCOs may be obtained (e.g., isolated and/or purified) from bacteria such as Rhizobia, e.g., Rhizobium sp., Bradyrhizobium sp., Sinorhizobium sp. and Azorhizobium sp.
  • Rhizobia e.g., Rhizobium sp., Bradyrhizobium sp., Sinorhizobium sp. and Azorhizobium sp.
  • LCO structure is characteristic for each such bacterial species, and each strain may produce multiple LCO's with different structures.
  • specific LCOs from S. meliloti have also been described in U.S. Patent 5,549,718 as having the formula II: in which R represents H or CH 3 CO-- and n is equal to 2 or 3.
  • LCOs from Bradyrhizobium japonicum are described in U.S. Patents 5,175,149 and 5,321,011 . Broadly, they are pentasaccharide phytohormones comprising methylfucose. A number of these B.
  • BjNod-V C 18:1
  • BjNod-V Ac, C 18:1
  • BjNod-V C 16:1
  • BjNod-V A C , C 16:0
  • V indicating the presence of five N-acetylglucosamines
  • Ac an acetylation
  • the number following the "C” indicating the number of carbons in the fatty acid side chain
  • the number following the ":” the number of double bonds
  • LCO's used in embodiments of the invention may be recovered from bacterial strains that produce LCO's, such as strains of Azorhizobium, Bradyrhizobium (including B. japonicum), Mesorhizobium, Rhizobium (including R. leguminosarum), Sinorhizobium (including S. meliloti), and bacterial strains genetically engineered to produce LCO's.
  • LCO's are the primary determinants of host specificity in legume symbiosis ( Diaz, et al., Mol. Plant-Microbe Interactions 13:268-276 (2000 )).
  • specific genera and species of rhizobia develop a symbiotic nitrogen-fixing relationship with a specific legume host.
  • These plant-host/bacteria combinations are described in Hungria, et al., Soil Biol. Biochem. 29:819-830 (1997 ), Examples of these bacteria/legume symbiotic partnerships include S . meliloti / alfalfa and sweet clover; R. leguminosarum biovar viciae / peas and lentils; R.
  • Hungria also lists the effective flavonoid Nod gene inducers of the rhizobial species, and the specific LCO structures that are produced by the different rhizobial species. However, LCO specificity is only required to establish nodulation in legumes.
  • LCO low-density polystyrene
  • an LCO obtained from B. japonicum may be used to treat leguminous seed other than soybean and non-leguminous seed such as corn.
  • the pea LCO obtainable from R. leguminosarum illustrated in Fig. 1 can be used to treat leguminous seed other than pea and non-legumes too.
  • LCOs obtained e.g., isolated and/or purified
  • arbuscular mycorrhizal fungi such as fungi of the group Glomerocycota, e.g., Glomus intraradicus.
  • the structures of representative LCOs obtained from these fungi are described in WO 2010/049751 and WO 2010/049751 (the LCOs described therein also referred to as "Myc factors").
  • LCO compounds such as those described in WO2005/063784
  • recombinant LCO's produced through genetic engineering.
  • the basic, naturally occurring LCO structure may contain modifications or substitutions found in naturally occurring LCO's, such as those described in Spaink, Crit. Rev. Plant Sci. 54:257-288 (2000 ) and D'Haeze, et al., Glycobiology 12:79R-105R (2002 ).
  • Precursor oligosaccharide molecules (COs, which as described below, are also useful as plant signal molecules in the present invention) for the construction of LCOs may also be synthesized by genetically engineered organisms, e.g. , as in Samain, et al., Carb. Res. 302:35-42 (1997 ).
  • LCO's may be utilized in various forms of purity and may be used alone or in the form of a culture of LCO-producing bacteria or fungi.
  • OPTIMIZE® commercially available from Novozymes BioAg Limited
  • LCO-V(C18:1, MeFuc), MOR116 contains a culture of B. japonicum that produces an LCO (LCO-V(C18:1, MeFuc), MOR116) that is illustrated in Fig. 2 .
  • Methods to provide substantially pure LCO's include simply removing the microbial cells from a mixture of LCOs and the microbe, or continuing to isolate and purify the LCO molecules through LCO solvent phase separation followed by HPLC chromatography as described, for example, in U.S. Patent 5,549,718 . Purification can be enhanced by repeated HPLC, and the purifed LCO molecules can be freeze-dried for long-term storage.
  • Seeds may be treated with the plant signal molecule in several ways but preferably via spraying or dripping.
  • Spray and drip treatment may be conducted by formulating an effective amount of the plant signal molecule in an agriculturally acceptable carrier, typically aqueous in nature, and spraying or dripping the composition onto seed via a continuous treating system (which is calibrated to apply treatment at a predefined rate in proportion to the continuous flow of seed), such as a drum-type of treater.
  • a continuous treating system which is calibrated to apply treatment at a predefined rate in proportion to the continuous flow of seed
  • These methods advantageously employ relatively small volumes of carrier so as to allow for relatively fast drying of the treated seed. In this fashion, large volumes of seed can be efficiently treated.
  • Batch systems in which a predetermined batch size of seed and signal molecule compositions are delivered into a mixer, may also be employed. Systems and apparati for performing these processes are commercially available from numerous suppliers, e.g. , Bayer CropScience (Gustafson).
  • the treatment entails coating seeds.
  • One such process involves coating the inside wall of a round container with the composition, adding seeds, then rotating the container to cause the seeds to contact the wall and the composition, a process known in the art as "container coating".
  • Seeds can be coated by combinations of coating methods. Soaking typically entails use of an aqueous solution containing the plant growth enhancing agent. For example, seeds can be soaked for about 1 minute to about 24 hours ( e.g. , for at least 1 min, 5 min, 10 min, 20 min, 40 min, 80 min, 3 hr, 6 hr, 12 hr, 24 hr). Some types of seeds (e.g., soybean seeds) tend to be sensitive to moisture. Thus, soaking such seeds for an extended period of time may not be desirable, in which case the soaking is typically carried out for about 1 minute to about 20 minutes.
  • the compositions containing the plant signal molecule may further contain a sticking or coating agent to assist in adherence of the signal molecule to the seed.
  • the compositions may further contain a coating polymer and/or a colorant.
  • the effective amount of the plant signal molecule used to treat the seed generally ranges from about 10 -5 to about 10 -14 M , and in some embodiments, from about 10 -5 to about 10 -11 M, and in some other embodiments from about 10 -7 to about 10 -8 M. Expressed in units of weight, the effective amount generally ranges from about 1 to about 400 ⁇ g/hundred weight (cwt) seed, and in some embodiments from about 2 to about 70 ⁇ g/cwt, and in some other embodiments, from about 2.5 to about 3.0 ⁇ g/cwt seed.
  • the effective amount of the plant signal molecule may be obtained by a suitable dosage response assay, preferably, in a greenhouse and/or field study.
  • the treatment may also involve contacting the seed, prior, simultaneously with or sequentially to the contacting with the plant signal molecule, with an agriculturally/agronomically beneficial agent.
  • an agriculturally/agronomically beneficial agent refers to agents that when applied to seeds result in enhancement (which may be statistically significant) of plant characteristics such as plant stand, growth, vigor or yield in comparison to non-treated seeds.
  • agents that may be useful in the practice of the present invention includes, but is not limited to, diazotrophs, mycorrhizal fungi, herbicides, fungicides, insecticides, and phosphate solubilizing agents.
  • Suitable herbicides include bentazon, acifluorfen, chlorimuron, lactofen, clomazone, fluazifop, glufosinate, glyphosate, sethoxydim, imazethapyr, imazamox, fomesafe, flumiclorac, imazaquin, and clethodim. Commercial products containing each of these compounds are readily available. Herbicide concentration in the composition will generally correspond to the labeled use rate for a particular herbicide.
  • a "fungicide” as used herein and in the art is an agent that kills or inhibits fungal growth.
  • a fungicide "exhibits activity against” a particular species of fungi if treatment with the fungicide results in killing or growth inhibition of a fungal population (e.g., in the soil) relative to an untreated population.
  • Effective fungicides in accordance with the invention will suitably exhibit activity against a broad range of pathogens, including but not limited to Phytophthora, Rhizoctonia, Fusarium, Pythium, Phomopsis or Selerotinia and Phakopsora and combinations thereof.
  • fungicides may be suitable for use in the present invention. Suitable commercially available fungicides include PROTEGE, RIVAL or ALLEGIANCE FL or LS (Gustafson, Piano, TX), WARDEN RTA (Agrilance, St. Paul, MN), APRON XL, APRON MAXX RTA or RFC, MAXIM 4FS or XL (Syngenta, Wilmington, DE), CAPTAN (Arvesta, Guelph, Ontario) and PROTREAT (Nitragin Argentina, wholesome Ares, Argentina). Active ingredients in these and other commercial fungicides include, but are not limited to, fludioxonil, mefenoxam, azoxystrobin and metalaxyl. Commercial fungicides are most suitably used in accordance with the manufacturer's instructions at the recommended concentrations.
  • an insecticide "exhibits activity against” a particular species of insect if treatment with the insecticide results in killing or inhibition of an insect population relative to an untreated population.
  • Effective insecticides in accordance with the invention will suitably exhibit activity against a broad range of insects including, but not limited to, wireworms, cutworms, grubs, corn rootworm, seed corn maggots, flea beetles, chinch bugs, aphids, leaf beetles, and stink bugs.
  • Suitable commercially-available insecticides include CRUISER (Syngenta, Wilmington, DE), GAUCHO and PONCHO (Gustafson, Piano, TX). Active ingredients in these and other commercial insecticides include thiamethoxam, clothianidin, and imidacloprid. Commercial insecticides are most suitably used in accordance with the manufacturer's instructions at the recommended concentrations.
  • phosphate solubilizing agents include, but are not limited to, phosphate solubilizing microorganisms.
  • phosphate solubilizing microorganism is a microorganism that is able to increase the amount of phosphorous available for a plant.
  • Phosphate solubilizing microorganisms include fungal and bacterial strains.
  • the phosphate solubilizing microorganism is a spore forming microorganism.
  • Non-limiting examples of phosphate solubilizing microorganisms include species from a genus selected from the group consisting of Acinetobacter, Arthrobacter, Arthrobotrys, Aspergillus, Azospirillum, Bacillus, Burkholderia, Candida Chryseomonas, Enterobacter, Eupenicillium, Exiguobacterium, Klebsiella, Kluyvera, Microbacterium, Mucor, Paecilomyces, Paenibacillus, Penicillium, Pseudomonas, Serratia, Stenotrophomonas, Streptomyces, Streptosporangium, Swaminathania, Thiobacillus, Torulospora, vibrio, Xanthobacter, and Xanthomonas.
  • Acinetobacter Arthrobacter, Arthrobotrys
  • Aspergillus Azospirillum
  • Bacillus Burkholderia
  • Non-limiting examples of phosphate solubilizing microorganisms are selected from the group consisting Acinetobacter calcoaceticus, Acinetobacter sp, Arthrobacter sp., Arthrobotrys oligospora, Aspergillus niger, Aspergillus sp., Azospirillum halopraeferans, Bacillus amyloliquefaciens, Bacillus atrophaeus, Bacillus circulans,Bacillus licheniformis, Bacillus subtilis, Burkholderia cepacia, Burkholderia vietnamiensis, Candida krissii, Chryseomonas luteola, Enterobacter aerogenes, Enterobacter asburiae, Enterobacter sp., Enterobacter taylorae, Eupenicillium parvum, Exiguobacterium sp., Klebsiella sp., Kluyvera cryo
  • the phosphate solubilizing microorganism is a strain of the fungus Penicillium.
  • Strains of the fungus Penicillium that may be useful in the practice of the present invention include P . bilaiae (formerly known as P . bilaii), P. albidum, P. aurantiogriseum, P. chrysogenum, P. citreonigrum, P. citrinum, P. digitatum, P. frequentas, P. fuscum, P. gaestrivorus, P. glabrum, P. griseoful vum, P. implicatum, P. janthinellum, P. lilacinum, P. minioluteum, P.
  • montanense P. nigricans, P. oxalicum, P. pinetorum, P. pinophilum, P. purpurogenum, P. radicans, P. radicum, P. raistrickii, P. rugulosum, P. simplicissimum, P. solitum, P. variabile, P. velutinum, P. viridicatum, P. glaucum, P. fussiporus, and P. expansum.
  • the phosphate solubilizing microorganism Penicillium species is P. bilaiae, P. gaestrivorus, and/or a combination thereof.
  • the P . bilaiae strains are selected from the group consisting of ATCC 20851, NRRL 50169, ATCC 22348, ATCC 18309, NRRL 50162 ( Wakelin, et al., 2004. Biol Fertil Soils 40:36-43 ) and the P . gaestrivorus strain is NRRL 50170 ( see , Wakelin, supra .).
  • more than one phosphate solubilizing microorganism may be used, such as, at least two, at least three, at least four, at least five, at least six, including any combination of the Acinetobacter, Arthrobacter, Arthrobotrys, Aspergillus, Azospirillum, Bacillus, Burkholderia, Candida Chryseomonas, Enterobacter, Eupenicillium, Exiguobacterium, Klebsiella, Kluyvera, Microbacterium, Mucor, Paecilomyces, Paenibacillus, Penicillium, Pseudomonas, Serratia, Stenotrophomonas, Streptomyces, Streptosporangium, Swaminathania, Thiobacillus, Torulospora, Vibrio, Xanthobacter, and Xanthomonas, including one species selected from the following group: Acinetobacter calcoaceticus, Acineto
  • Diazotrophs are bacteria and archaea that fix atmospheric nitrogen gas into a more usable form such as ammonia.
  • Examples of diazotrophs include bacteria from the genera Rhizobium spp. (e.g., R. cellulosilyticum, R. daejeonense, R. etli, R. galegae, R. gallicum, R. giardinii, R. hainanense, R. huautlense, R. indigoferae, R. leguminosarum, R. loessense, R. lupini, R. lusitanum, R. meliloti, R. mongolense, R. miluonense, R. sullae, R.
  • Rhizobium spp. e.g., R. cellulosilyticum, R. daejeonense, R. etli, R. galegae, R. gallicum, R. giardini
  • Bradyrhizobium spp. e.g., B. bete, B. canariense, B. elkanii, B. iriomotense, B. japonicum, B. jicamae, B. liaoningense, B. pachyrhizi, and/or B. yuanmingense
  • Azorhizobium spp. e.g., A. caulinodans and/or A. doebereinerae
  • Sinorhizobium spp. e.g., S. abri, S. adhaerens, S. americanum, S.
  • the diazotroph is selected from the group consisting of B. japonicum, R leguminosarum, R meliloti, S. meliloti, and combinations thereof.
  • the diazotroph is B. japonicum.
  • the diazotroph is R leguminosarum.
  • the diazotroph is R meliloti.
  • the diazotroph is S. meliloti.
  • Mycorrhizal fungi form symbiotic associations with the roots of a vascular plant, and provide, e.g., absorptive capacity for water and mineral nutrients due to the comparatively large surface area of mycelium.
  • Mycorrhizal fungi include endomycorrhizal fungi (also called vesicular arbuscular mycorrhizae, VAMs, arbuscular mycorrhizae, or AMs), an ectomycorrhizal fungi, or a combination thereof.
  • the mycorrhizal fungi is an endomycorrhizae of the phylum Glomeromycota and genera Glomus and Gigaspora.
  • the endomycorrhizae is a strain of Glomus aggregatum, Glomus brasilianum, Glomus clarum, Glomus deserticola, Glomus etunicatum, Glomus fasciculatum, Glomus intraradices, Glomus monosporum, or Glomus mosseae, Gigaspora margarita, or a combination thereof.
  • mycorrhizal fungi examples include ectomycorrhizae of the phylum Basidiomycota, Ascomycota, and Zygomycota.
  • Other examples include a strain of Laccaria bicolor, Laccaria laccata, Pisolithus tinctorius, Rhizopogon amylopogon, Rhizopogon fulvigleba, Rhizopogon luteolus, Rhizopogon villosuli, Scleroderma cepa, Scleroderma citrinum, or a combination thereof.
  • the mycorrhizal fungi include ecroid mycorrhizae, arbutoid mycorrhizae, or monotropoid mycorrhizae.
  • Arbuscular and ectomycorrhizae form ericoid mycorrhiza with many plants belonging to the order Ericales, while some Ericales form arbutoid and monotropoid mycorrhizae.
  • the mycorrhiza may be an ericoid mycorrhiza, preferably of the phylum Ascomycota, such as Hymenoscyphous ericae or Oidiodendron sp.
  • the mycorrhiza also may be an arbutoid mycorrhiza, preferably of the phylum Basidiomycota.
  • the mycorrhiza may be a monotripoid mycorrhiza, preferably of the phylum Basidiomycota.
  • the mycorrhiza may be an orchid mycorrhiza, preferably of the genus Rhizoctonia.
  • the methods of the present invention are applicable to leguminous seed, representative examples of which include soybean, alfalfa, peanut, pea, lentil, bean and clover.
  • the methods of the present invention are also applicable to non-leguminous seed, e.g. , Poaceae, Cucurbitaceae, Malvaceae. Asteraceae, Chenopodiaceae and Solonaceae.
  • Representative examples of non-leguminous seed include field crops such as corn, cereals such as rice, barley and wheat, cotton and canola, and vegetable crops such as potatoes, tomatoes, cucumbers, beets, lettuce and cantaloupe.
  • the seed is then packaged, e.g. , in 50-lb or 100-lb bags, or bulk bags or containers, in accordance with standard techniques.
  • the seed is stored for at least 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 months, and even longer, e.g., 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36 months, or even longer, under appropriate storage conditions which are known in the art.
  • the term "month” shall mean 30 days.
  • a year shall mean 365 days. Whereas soybean seed may have to be planted the following season, corn seed can be stored for much longer periods of time including upwards of 3 years.
  • the plant signal molecule may be applied in any suitable manner, such as, in the form of a seed treatment composition which comprises at least one plant signal molecule and an agriculturally acceptable carrier.
  • Any suitable agriculturally acceptable carrier may be used, for example, a solid carrier, semi-solid carrier, an aqueous-based liquid carrier, a non-aqueous based liquid carrier, a suspension, an emulsion or an emulsifiable concentrate.
  • Agriculturally-acceptable carriers may include, e.g., adjuvants, inert components, dispersants, surfactants, tackifiers, binders, stabilizing agents, and/or polymers.
  • the seed treatment composition may further include one or more agriculturally/agronomically beneficial agents (that is in addition to the signal molecule), such as, one or more diazotrophs, mycorrhizal fungi, herbicides, fungicides, insecticides, and/or phosphate solubilizing agents.
  • one or more agriculturally/agronomically beneficial agents such as, one or more diazotrophs, mycorrhizal fungi, herbicides, fungicides, insecticides, and/or phosphate solubilizing agents.
  • Examples 1 and 2 describe comparative field experiments using soybean seed that demonstrate that the claimed invention achieves increased plant yield.
  • Seed were treated in accordance with the present invention at 5 months prior to planting with the commercial product Optimize® which is a combination of Bradyrhizobium japonicum inoculant and LCO-V (C18:1, MeFuc)(illustrated in Fig. 2 ), and with the pure LCO alone, and at 4.5 months prior to planting with non-commercial ( i.e. , less pure) grades of Optimize® and the LCO alone, and for purposes of comparison with these same plant signal molecules at the time of planting. Untreated seed was used as another control.
  • Examples 3 and 4 describe comparative experiments conducted in the greenhouse and which demonstrate that the claimed invention achieves increases in other plant growth characteristics.
  • Example 3 describes an experiment that entailed treatment of soybean seed with pure LCO-V (C18:1, MeFuc) one month and one year before planting. The soybean plants (including roots) were harvested ten days after planting. Results, which are described in terms of differences in root length and volume, show the methods of the present invention achieve dramatic increases in these properties.
  • Example 4 describes experiments conducted with soybean seed treated with Optimize® 55 days prior to planting and for purposes of comparison, soybean seed treated 7 days prior to planting and untreated seed. The results, expressed in units of mean surface area of first trifoliate leaves, show that the claimed invention enhances plant growth in this respect too.
  • a field trial was conducted to evaluate embodiments of the present invention on grain yield when applied on soybean seed.
  • the field trial site was located near Whitewater, WI and characterized by Milford silty clay loam soil. Soil testing, conducted six months prior to planting, showed a soil pH of 6.8, an organic matter content of 5.3%, and phosphorus and potassium contents of 39 ppm and 139 ppm, respectively.
  • the plant signal molecules used in the trial were Optimize®, a non-commercial grade of Optimize® (NI-50S-1), pure LCO-V (C18:1, MeFuc)(NI-50GREN-1) and a non-commercial grade of LCO-V (C18:1, MeFuc) ( NI-50S-2CF).
  • the soybean seed used in the study was Stine S2118.
  • the plant signal molecules were sprayed onto seeds with/without dilution at a rate of 4.8 fl oz/cwt.
  • Control seed was treated with an amount (wt) of water, corresponding to the amount (wt) of the experimental signal molecule composition (signal molecule + carrier).
  • the Control seed was stored under the same conditions as the experimental seed prior to planting and planted at the same time as the experimental seed in the same soil.
  • Table 1 TREATMENT GROUP GRAIN YIELD @ 13% 1 Control - non-inoculated 62.5 2 Optimize - at planting 64.2 3 Optimize - 5 month 65.7 4 NI-50GREN-1 - At planting 62.2 5 NI-50GREN-1 - 5 month 70.5 6 NI-50S-1 - 4.5 month 67.2 7 NI-50S-2CF - 4.5 month 69.6
  • a soybean trial was conducted to evaluate embodiments of the present invention on grain yield when applied on soybean seed.
  • the field trial site was located near Whitewater, WI and characterized by Milford silty clay loam soil. Soil testing, conducted six months prior to planting, showed a soil pH of 6.6, an organic matter content of 4.8%, and phosphorus and potassium contents of 41 ppm and 131 ppm, respectively.
  • the plant signal molecules used in the trial were same as in Example 1.
  • the soybean seed used in the study was Stine S2118.
  • the plant signal molecules were sprayed onto seeds with/without dilution at a rate of 4.8 fl oz/cwt.
  • Control seed was treated with an amount (wt) of water, corresponding to the amount (wt) of the experimental signal molecule composition (signal molecule + carrier).
  • the Control seed was stored under the same conditions as the experimental seed prior to planting and planted at the same time as the experimental seed in the same soil.
  • Table 2 TREATMENT GROUP GRAIN YIELD @ 13% 1 Control - non-inoculated 62.4 2 Optimize - at planting 64.1 3 Optimize - 5 month 68.6 4 NI-50GREN-1 - At planting 65.8 5 NI-50GREN-1 - 5 month 64.0 6 NI-50S-1 - 4.5 month 69.4 7 NI-50S-2CF - 4.5 month 66.6
  • Treated seeds and non-treated seeds (control) were planted 1 and 12 months after treatment in greenhouse pots containing sand:perlite (1:1 mixture). Seedlings were grown for 10 days after seed plantings then seedlings were harvested, their roots cleaned and measured on the Winrhizo® scanner.
  • the Control seed was treated with an amount (wt) of water, corresponding to the amount (wt) of the experimental signal molecule composition (signal molecule + carrier).
  • the Control seed was stored under the same conditions as the experimental seed prior to planting and planted at the same time as the experimental seed in the same soil. The results are shown in Table 3.
  • Soybean seeds treated with Optimize® were kept at 15°C in a refrigerator. Seeds were planted 7 (7 dpp) and 55 (55dpp) days after treatment in root boxes containing a peat:perlite mix. Their leaf surface area (cm 2 ) were taken from the first trifoliate after 19 days. As illustrated in Fig. 3 and shown in Table 4, the leaves generated from seed treated in accordance with the present invention had a 50% greater mean increase in leaf surface area compared to the non-inventive embodiment (42% versus 28%). TABLE 4 Mean STDEV Response Response% UTC mean 146.25 18.7539 7dpp mean 187.05 29.8215 40.81 28% 55dpp mean 207.18 20.5278 60.93 42%
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